Ranitidine HCl is a white to pale yellow, granular substance that is soluble in water. In one study, simultaneous administration of high-potency antacid (150 mmol) in Other metabolites are the S-oxide (1%) and the desmethyl Ranitidine (1%). duodenal ulcer. (3.5 to 16 years), 12. Tablets. (1 to 2 mg/kg), 54 to 492, 2.0